head/tail-light problem 00 f150
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head/tail-light problem 00 f150
I always help my neighbors with their stuff as they always reciprocate in helping me in mine so i just got made aware of a dilemma:
The tail lights do not turn off- the head lights do not turn on. every fuse was pulled and still the tail lights stayed on. Headlight switch was swapped out with a new one to eliminate it with no different result. No modifications known to have been made to the electrical system. This thing did spend a lot of time in NY state, so corrosion is likely. But this does not explain how/why the tail lights would stay on even if the headlight switch was off... IMO this would have to be an ignition switch issue. Does any of this sound familiar to anyone? THANKS.
The tail lights do not turn off- the head lights do not turn on. every fuse was pulled and still the tail lights stayed on. Headlight switch was swapped out with a new one to eliminate it with no different result. No modifications known to have been made to the electrical system. This thing did spend a lot of time in NY state, so corrosion is likely. But this does not explain how/why the tail lights would stay on even if the headlight switch was off... IMO this would have to be an ignition switch issue. Does any of this sound familiar to anyone? THANKS.
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ALL fuses in the underdash fuse box AND the underhood fuse box? They are getting power from somewhere. Pull the battery cable. The first thing you need to do is figure out what circuit is supplying the power. Then you can make a guess where the wiring could be damaged or whatever and start looking. If you have some stuff added to the battery terminals, take those wires off also(like trailer brake controllers, etc.)
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Sorry for my absence- working sucks.
If it was just the brake lights staying on i would suspect the brake light switch. If it was just the head lights not working on i would suspect the head light switch. But both conditions? There must be a common link there. how are the headlights fused? I am leaning toward an ignition switch issue. There is a little flat spring contact that closes a circuit powering interior lights and whatever else. Maybe that same spring also cuts power to the head lights when turning the ignition to start. I never took apart a column as new (lol) as 2000 models- im picturing a GM column from the 80s.
If it was just the brake lights staying on i would suspect the brake light switch. If it was just the head lights not working on i would suspect the head light switch. But both conditions? There must be a common link there. how are the headlights fused? I am leaning toward an ignition switch issue. There is a little flat spring contact that closes a circuit powering interior lights and whatever else. Maybe that same spring also cuts power to the head lights when turning the ignition to start. I never took apart a column as new (lol) as 2000 models- im picturing a GM column from the 80s.
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To clarify:
All the marker lights stay on incl. tail, turn/brake lights work normally, No headlights.
All the marker lights stay on incl. tail, turn/brake lights work normally, No headlights.
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From: Virginia
You need to pull ALL the fuses till the marker lights go out. The main headlight switch is fed from fuse 3 in the underhood fuse box. After it goes through the switch, it leaves the switch and and goes to the steering column where the multi-function switch selects high or low beam. The high and low beam wires leave the steering column, the highbeam wire goes directly to the underdash fuse box and goes through fuse 16, 20 amp, and then goes out to the high beam lights.
The lowbeams leave the steering column and go through a drl box if you have drl's. If you don't have drl's, the low beam wire goes directly to the underdash fuse box. There it spreads out into two fuses, fuse 28 and 26. The fuse the lowbeams separately, the high beams only have one fuse for both.
The marker lights are fed separately, even though they go through the same headlight switch. Just a different part of the switch. They start out with fuse 6, 15 amp in the underhood fuse box. It goes to the headlight switch, and comes out of it on brown wire which has splices and feeds all the different lights front to rear on the whole truck with the brown wire.
The lowbeams leave the steering column and go through a drl box if you have drl's. If you don't have drl's, the low beam wire goes directly to the underdash fuse box. There it spreads out into two fuses, fuse 28 and 26. The fuse the lowbeams separately, the high beams only have one fuse for both.
The marker lights are fed separately, even though they go through the same headlight switch. Just a different part of the switch. They start out with fuse 6, 15 amp in the underhood fuse box. It goes to the headlight switch, and comes out of it on brown wire which has splices and feeds all the different lights front to rear on the whole truck with the brown wire.
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